wp-theme-support.php

    <?php

    /**
     * Theme support Blocks
     * @link https://developer.wordpress.org/block-editor/how-to-guides/themes/theme-support/
     */

    function andres_gutenberg_default_colors()

    {
        // Color Palette Support
        add_theme_support(
            'editor-color-palette',
            array(
                array(
                    'name' => 'White',
                    'slug' => 'white',
                    'color' => '#ffffff'
                ),
                array(
                    'name' => 'Black',
                    'slug' => 'black',
                    'color' => '#000000'
                ), array(
                    'name' => 'Pink',
                    'slug' => 'pink',
                    'color' => '#ff4444'
                )
            )
        );
        // Font Size Support
        add_theme_support(
            'editor-font-sizes',
            array(
                array(
                    'name' => 'Normal',
                    'slug' => 'normal',
                    'size' => '1rem'
                ),
                array(
                    'name' => 'Medium',
                    'slug' => 'medium',
                    'size' => '1.5rem'
                ),
                array(
                    'name' => 'Large',
                    'slug' => 'large',
                    'size' => '2rem'
                ),
                array(
                    'name' => 'Extra Large',
                    'slug' => 'extra-large',
                    'size' => '2.5rem'
                )
            )
        );
        // Gradiente Color Support
        add_theme_support(
            'editor-gradient-presets',
            array(
                array(
                    'name'     => esc_attr__('Vivid cyan blue to vivid purple', 'themeLangDomain'),
                    'gradient' => 'linear-gradient(135deg,rgba(6,147,227,1) 0%,rgb(155,81,224) 100%)',
                    'slug'     => 'vivid-cyan-blue-to-vivid-purple'
                )
            )
        );
    }

    add_action('init', 'andres_gutenberg_default_colors');